* Change makeseeds.py to use masternode list as input instead of DNS seed dump
* Allow 4 nodes per ASN
Lift the limitation a bit so we get more entries
* Update nodes_main.txt and nodes_test.txt
Generated with makeseeds.py based on current masternode lists
* Fix comment about the source of the seed nodes and use masternodelist rpc
* Use fixed OpenDNS servers for ASN filtering
- Moved all seed related scripts to contrib/seeds for consistency
- Updated `makeseeds.py` to handle IPv6 and onions, fix regular
expression for recent Bitcoin Core versions
- Fixed a bug in `generate-seeds.py` with regard to IPv6 parsing
